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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2011, Blender Foundation.
*/
#include "COM_MapUVOperation.h"
#include "BLI_math.h"
MapUVOperation::MapUVOperation()
{
this->addInputSocket(DataType::Color, COM_SC_NO_RESIZE);
this->addInputSocket(DataType::Vector);
this->addOutputSocket(DataType::Color);
this->m_alpha = 0.0f;
this->setComplex(true);
setResolutionInputSocketIndex(1);
this->m_inputUVProgram = nullptr;
this->m_inputColorProgram = nullptr;
}
void MapUVOperation::initExecution()
{
this->m_inputColorProgram = this->getInputSocketReader(0);
this->m_inputUVProgram = this->getInputSocketReader(1);
}
void MapUVOperation::executePixelSampled(float output[4],
float x,
float y,
PixelSampler /*sampler*/)
{
float xy[2] = {x, y};
float uv[2], deriv[2][2], alpha;
pixelTransform(xy, uv, deriv, alpha);
if (alpha == 0.0f) {
zero_v4(output);
return;
}
/* EWA filtering */
this->m_inputColorProgram->readFiltered(output, uv[0], uv[1], deriv[0], deriv[1]);
/* UV to alpha threshold */
const float threshold = this->m_alpha * 0.05f;
/* XXX alpha threshold is used to fade out pixels on boundaries with invalid derivatives.
* this calculation is not very well defined, should be looked into if it becomes a problem ...
*/
float du = len_v2(deriv[0]);
float dv = len_v2(deriv[1]);
float factor = 1.0f - threshold * (du / m_inputColorProgram->getWidth() +
dv / m_inputColorProgram->getHeight());
if (factor < 0.0f) {
alpha = 0.0f;
}
else {
alpha *= factor;
}
/* "premul" */
if (alpha < 1.0f) {
mul_v4_fl(output, alpha);
}
}
bool MapUVOperation::read_uv(float x, float y, float &r_u, float &r_v, float &r_alpha)
{
float width = m_inputUVProgram->getWidth();
float height = m_inputUVProgram->getHeight();
if (x < 0.0f || x >= width || y < 0.0f || y >= height) {
r_u = 0.0f;
r_v = 0.0f;
r_alpha = 0.0f;
return false;
}
float vector[3];
m_inputUVProgram->readSampled(vector, x, y, COM_PS_BILINEAR);
r_u = vector[0] * m_inputColorProgram->getWidth();
r_v = vector[1] * m_inputColorProgram->getHeight();
r_alpha = vector[2];
return true;
}
void MapUVOperation::pixelTransform(const float xy[2],
float r_uv[2],
float r_deriv[2][2],
float &r_alpha)
{
float uv[2], alpha; /* temporary variables for derivative estimation */
int num;
read_uv(xy[0], xy[1], r_uv[0], r_uv[1], r_alpha);
/* Estimate partial derivatives using 1-pixel offsets */
const float epsilon[2] = {1.0f, 1.0f};
zero_v2(r_deriv[0]);
zero_v2(r_deriv[1]);
num = 0;
if (read_uv(xy[0] + epsilon[0], xy[1], uv[0], uv[1], alpha)) {
r_deriv[0][0] += uv[0] - r_uv[0];
r_deriv[1][0] += uv[1] - r_uv[1];
num++;
}
if (read_uv(xy[0] - epsilon[0], xy[1], uv[0], uv[1], alpha)) {
r_deriv[0][0] += r_uv[0] - uv[0];
r_deriv[1][0] += r_uv[1] - uv[1];
num++;
}
if (num > 0) {
float numinv = 1.0f / (float)num;
r_deriv[0][0] *= numinv;
r_deriv[1][0] *= numinv;
}
num = 0;
if (read_uv(xy[0], xy[1] + epsilon[1], uv[0], uv[1], alpha)) {
r_deriv[0][1] += uv[0] - r_uv[0];
r_deriv[1][1] += uv[1] - r_uv[1];
num++;
}
if (read_uv(xy[0], xy[1] - epsilon[1], uv[0], uv[1], alpha)) {
r_deriv[0][1] += r_uv[0] - uv[0];
r_deriv[1][1] += r_uv[1] - uv[1];
num++;
}
if (num > 0) {
float numinv = 1.0f / (float)num;
r_deriv[0][1] *= numinv;
r_deriv[1][1] *= numinv;
}
}
void MapUVOperation::deinitExecution()
{
this->m_inputUVProgram = nullptr;
this->m_inputColorProgram = nullptr;
}
bool MapUVOperation::determineDependingAreaOfInterest(rcti *input,
ReadBufferOperation *readOperation,
rcti *output)
{
rcti colorInput;
rcti uvInput;
NodeOperation *operation = nullptr;
/* the uv buffer only needs a 3x3 buffer. The image needs whole buffer */
operation = getInputOperation(0);
colorInput.xmax = operation->getWidth();
colorInput.xmin = 0;
colorInput.ymax = operation->getHeight();
colorInput.ymin = 0;
if (operation->determineDependingAreaOfInterest(&colorInput, readOperation, output)) {
return true;
}
operation = getInputOperation(1);
uvInput.xmax = input->xmax + 1;
uvInput.xmin = input->xmin - 1;
uvInput.ymax = input->ymax + 1;
uvInput.ymin = input->ymin - 1;
if (operation->determineDependingAreaOfInterest(&uvInput, readOperation, output)) {
return true;
}
return false;
}
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